MCQ On Biomolecule Class-12 » Chemistry-Papers

Which carbohydrate is used in silvering of mirror?

(B) Fructose

(A) Sucrose

(D) B and C

D-Glucose and L-Glucose are

enantiomers

anomers

diastereomers

epimers

Identify the pair of epimers

D-glucose and D-mannose

D-glucose and L-glucose

D-glucose and D-fructose

D-glucose and D-mannose

Carbohydrates have

–OH group

> C = O group

All

–CHO group

Carbohydrate that cannot be hydrolysed further to give simpler unit of polyhydroxy aldehyde or ketone.

Polysaccharide

Oligosaccharide

Monosaccharide

How many amino acids (approximately) are involved during the synthesis of protein?

Which of the following is the correct statement?

Proteins are composed of only one type of amino acid

Starch is a polymer of α-glucose

Amylose is not a component of starch

What will be the sequence of complimentary strand of DNA if the one strand of DNA has the sequence of TATGACTG?

ATACTGAC

ATACACTC

ATACTGCA

Osazone formation involves only 2 carbon atoms of glucose because of

hydrolysis

reduction

oxidation

chelation

Which one of the following is non-reducing sugar?

Maltose

Glucose

Sucrose

Fructose

Fehling’s solution test is given by

fructose

all of these

lactose

glucose

Select the base which is not common in DNA and RNA.

Adenine (A)

Guanine (B)

Cytosine (C)

Uracil (U)

Which of the following vitamins is water soluble?

Riboflavin

Vitamin E

Vitamin D

Find out the correct option among the following statements.

Fehling’s solution and Tollen’s reagent are non-reducing sugar

Maltose and lactose are non-reducing sugar

In reducing sugars, aldehydic and ketone group are free bonded

All monosaccharides whether aldoses or ketoses are reducing sugar

Which one of the following is reducing sugar?

Fructose

Starch

Glycogen

Cellulose

Vitamin A is present in-

fish liver oil

butter

all of these

milk

Which of the following statements is not correct?

In alpha-amino acids, - NH2 and – COOH groups are attached to different carbon atoms.

Natural proteins are commonly made up of L-isomer of amino acids (D) In -amino acids, - NH2 and

Except glycine, all other amino acids show optical activity

Glucose cannot be classified as ?

Carbohydrate

Hexose

Aldose

Oligosaccharide

Vitamin C must be supplied regularly in diet because

it is fat soluble hence stored in the body and cannot be used on regular basis

it is water soluble hence excreted in urine and can’t be stored in the body

it is water soluble hence used by the body on daily basis and is to be supplied regularly

Which is a fat soluble vitamin?

Vitamin B6

Vitamin A

Vitamin C

How many number of water molecules are removed from the n number of amino acids during the formation of peptide bond?

(n – 2)

(n – 3)

(n – 1)

The two monosaccharide units obtained on hydrolysis of disaccharide may be

same

both

different

The pair of compounds in which both the compounds give positive test with Tollen’s reagent is

glucose and sucrose

glucose and fructose

fructose and sucrose

Which of the following bases is not present in RNA?

Cytosine

Adenine

Thymine

Millon’s test is given by

Sucrose

ester

Proteins

Fructose reduce Tollen’s reagent due to

secondary alcoholic group

primary alcoholic group

enolisation of fructose followed by conversion of aldehyde by base

Molisch’s test reagent is

5% solution of α-Napthol in alcohol and few droplets of conc. H2SO4

both

1% of β-Napthol in alcohol

Reduction of hexose A (molecular formula C6H12O6) with sodium borohydride gives compound B and C. Compound B is optically inactive, whereas compound C is optically active . Which of the following is compound A?

D-mannose

D-galactose

D-glucose

D-fructose

Deficiency of vitamin E causes

Muscular weakness

Sterility Anaemia

Scurvy

Guanine is an example of

a nucleoside

a nitrogenous base

a nucleotide

In iodine test of starch which colour of ppt had been observed

blue

black

red

Proteins are the polymers of -amino acids and they are connected to each other by ------

ionic bond

coordinate bond

peptide bond

Phosphodiester linkage is present between which carbon atoms of pentose sugars of nucleotides?

1’ and 5’

5’ and 5’

5’ and 3’

3’ and 3’

Deficiency of biotin causes dermatitis and paralysis, biotin is also known as

vitamin H

vitamin D

vitamin B12

Biuret test is used for